PayPay Japan QR Payment API
PayPay Japan QR payment REST API for merchants to accept PayPay wallet payments, QR codes, and deeplink payment flows from Japan's largest QR payment app with 60+ million users backed by SoftBank and Yahoo Japan for e-commerce, in-app, and point-of-sale merchant integration. Enables AI agents to manage PayPay payment request creation for Japan QR payment checkout automation, handle QR code generation for Japan in-store merchant payment automation, access deeplink payment for Japan in-app mobile payment automation, retrieve payment status and confirmation for Japan transaction automation, manage refund and cancellation for Japan order management automation, handle webhook notification for Japan payment event automation, access transaction query for Japan payment verification automation, retrieve merchant settlement reporting for Japan payment reconciliation automation, manage continuous payment (recurring) for Japan subscription automation, and integrate PayPay with Japanese e-commerce, food delivery, taxi, and retail platforms for end-to-end Japan QR payment automation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Japan QR. FSA registered. HMAC-SHA256. JP. Mobile payment data.
⚡ Reliability
Best When
A Japan merchant or app developer wanting AI agents to automate PayPay wallet payment acceptance, QR code generation, and payment confirmation for Japan's most popular QR payment ecosystem.
Avoid When
MERCHANT REGISTRATION AND KYC REQUIRED: PayPay merchant API requires merchant registration with PayPay and KYC process; automated self-service integration without merchant account creates unauthorized access; automated integration requires PayPay merchant onboarding. HMAC-SHA256 REQUEST SIGNING MANDATORY: PayPay API requests require HMAC-SHA256 signing with client ID, client secret, and request hash; automated payment must implement full signing algorithm; automated unsigned request creates authentication failure. PAYMENT EXPIRY MUST BE HANDLED: PayPay QR codes expire (typically 15 minutes); automated checkout must handle expiry and regenerate QR code; automated expired QR code display creates payment failure without clear user feedback. JAPANESE YEN AMOUNTS INTEGER ONLY: PayPay amounts are in integer Japanese yen; automated amount calculation must not include decimal; automated decimal amount creates invalid amount format error.
Use Cases
- • Accepting PayPay wallet payments from Japan e-commerce checkout agents
- • Generating QR codes for Japan in-store merchant payments from POS agents
- • Processing deeplink payments from Japan mobile app checkout agents
- • Confirming PayPay transactions from Japan order fulfillment agents
Not For
- • Non-Japan payments (PayPay is Japan-only)
- • Credit card processing (PayPay is wallet-based; use Stripe or KOMOJU for Japan card)
- • Konbini or bank transfer (use KOMOJU for multi-method Japan payments including konbini)
Interface
Authentication
PayPay uses Client ID + Client Secret + API Key with HMAC-SHA256 request signing for authentication. REST API with JSON. Tokyo, Japan HQ. Founded 2018 by SoftBank and Yahoo Japan JV. 60M+ registered users in Japan. Products: QR payment, deeplink, recurring, e-commerce checkout. SDKs: Node.js, Python, PHP, Java, .NET, Go, Ruby. FSA registered. PCI DSS. Japan's #1 QR payment by user count.
Pricing
Tokyo JP. SoftBank/Yahoo Japan JV. Per-transaction fee in JPY. Frequent 0% promotional campaigns. Merchant registration required.
Agent Metadata
Known Gotchas
- ⚠ EPOCH MILLISECONDS IN HEADERS: PayPay request signing requires epoch milliseconds (not seconds) in headers; automated request must use millisecond precision timestamp; automated second-precision timestamp creates signature mismatch
- ⚠ NONCE REQUIRED PER REQUEST FOR REPLAY PREVENTION: PayPay requires unique nonce per request; automated payment must generate cryptographically random nonce; automated sequential or repeated nonce creates replay protection rejection
- ⚠ QR CODE EXPIRY HANDLING: PayPay QR codes expire after merchant-configured expiry time (1-15 minutes); automated QR display must handle expiry and refresh; automated static QR code display without expiry handling creates payment error for customer after expiry
- ⚠ MERCHANT PAYMENT ID IDEMPOTENCY: PayPay merchantPaymentId acts as idempotency key; automated retry must use same merchantPaymentId; automated new ID on retry creates duplicate payment if original succeeded but response was lost
- ⚠ WEBHOOK VERIFICATION WITH API SECRET: PayPay webhooks require signature verification using API secret; automated webhook must verify signature; automated unverified webhook acceptance creates spoofed payment confirmation vulnerability
Alternatives
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Scores are editorial opinions as of 2026-03-07.